It looks like NewSoftSerial is the way to go: http://arduiniana.org/libraries/newsoftserial/
For programming Atmegas without the bootloader, here's an article on using PL-2303 instead of FTDI: http://www.uchobby.com/index.php/2009/10/04/diy-usb-to-serial-cable-for-3/
The Arduino will happily stuff data out to the serial port, next I need to get it receive data.
Arduino print info: http://www.arduino.cc/en/Serial/Print
Good code example and comments on DIYDrones: http://diydrones.com/forum/topics/razor-9dof-gps-arduino
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